github.io, geojson.io 这些网站是不是限制了区域访问？

走台湾代理也打不开，换了美国的，居然就打开了。

比如：

https://mintty.github.io/

据说是网站本身就屏蔽了国内 IP 的访问？

这些域名，指向的都是同样的 IP：

> dig mintty.github.io

; <<>> DiG 9.17.6 <<>> mintty.github.io
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53838
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 4, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 8d366435970f39cc2161fa8461a9bdb7333e7e211a4b0415 (good)
;; QUESTION SECTION:
;mintty.github.io.              IN      A

;; ANSWER SECTION:
mintty.github.io.       3435    IN      A       185.199.110.153
mintty.github.io.       3435    IN      A       185.199.108.153
mintty.github.io.       3435    IN      A       185.199.111.153
mintty.github.io.       3435    IN      A       185.199.109.153

;; AUTHORITY SECTION:
io.                     98755   IN      NS      c0.nic.io.
io.                     98755   IN      NS      a2.nic.io.
io.                     98755   IN      NS      a0.nic.io.
io.                     98755   IN      NS      b0.nic.io.

;; ADDITIONAL SECTION:
c0.nic.io.              22      IN      A       65.22.162.17
c0.nic.io.              130     IN      AAAA    2a01:8840:a0::17

;; Query time: 200 msec
;; SERVER: 172.16.101.67#53(172.16.101.67)
;; WHEN: Fri Dec 03 14:48:24 China Standard Time 2021
;; MSG SIZE  rcvd: 253

> dig geojson.io

; <<>> DiG 9.17.6 <<>> geojson.io
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9417
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 4, ADDITIONAL: 3

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 52c857af3004ba5d01a9127c61a9bdb30a18e5753f7f2b31 (good)
;; QUESTION SECTION:
;geojson.io.                    IN      A

;; ANSWER SECTION:
geojson.io.             4       IN      A       185.199.109.153
geojson.io.             4       IN      A       185.199.111.153
geojson.io.             4       IN      A       185.199.110.153
geojson.io.             4       IN      A       185.199.108.153

;; AUTHORITY SECTION:
io.                     98759   IN      NS      a2.nic.io.
io.                     98759   IN      NS      c0.nic.io.
io.                     98759   IN      NS      b0.nic.io.
io.                     98759   IN      NS      a0.nic.io.

;; ADDITIONAL SECTION:
c0.nic.io.              26      IN      A       65.22.162.17
c0.nic.io.              134     IN      AAAA    2a01:8840:a0::17

;; Query time: 179 msec
;; SERVER: 172.16.101.67#53(172.16.101.67)
;; WHEN: Fri Dec 03 14:48:19 China Standard Time 2021
;; MSG SIZE  rcvd: 247